Jennifer Klein, M.D.
NPI 1861566184 · Internal Medicine Physician · Hayward, CA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jennifer Klein, M.D. is a Internal Medicine Physician provider in Hayward, CA (NPI 1861566184).
Provider details
- NPI number
- 1861566184
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A85449 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone Propion/Salmeterolbrand: Wixela Inhub | 54 | 13 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 47 | 18 |
| Azelastine Hcl | 47 | 13 |
| Ipratropium Bromide | 39 | 12 |
| Fluticasone Propionate | 39 | 14 |
| Flunisolide | 27 | — |
| Tiotropium Bromidebrand: Spiriva Respimat | 26 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-20
- Last updated
- 2021-12-20
Frequently asked questions
- What is Jennifer Klein's NPI number?
- Jennifer Klein's National Provider Identifier (NPI) is 1861566184, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jennifer Klein's specialty?
- Jennifer Klein is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jennifer Klein located?
- Jennifer Klein's practice location on file with NPPES is 27303 Sleepy Hollow Ave S, Hayward, CA 94545-4203.
- What is Jennifer Klein's phone number?
- The practice phone number listed in the NPPES registry for Jennifer Klein is (510) 454-1000.
- Does Jennifer Klein accept Medicare?
- Jennifer Klein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jennifer Klein's NPI active?
- Yes — Jennifer Klein's NPI (1861566184) is active in the NPPES registry as of the last update on 2021-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.